<template>
  <view class="content">
    <Navbar></Navbar>
    <scroll-view
      scroll-y
      class="main"
      @scrolltolower="onScrollTolower"
      @refresherrefresh="onReRresherRefresh"
      refresher-enabled
      :refresher-triggered="refresherTriggered"
    >
      <!-- 广告区域 -->
      <Carousel :banners="banners" height="280rpx"></Carousel>

      <!-- 前台类目 -->
      <CateScroll :categoryHeadMutli="categoryHeadMutli"></CateScroll>

      <!-- 人气推荐 -->
      <view class="panel recommend">
        <view class="item" v-for="item in hotMutli" :key="item.id">
          <view class="title">
            {{ item.title }}<text>{{ item.alt }}</text>
          </view>
          <navigator
            hover-class="none"
            :url="`/pages/recommend/index?type=${item.type}`"
            class="cards"
          >
            <image
              mode="aspectFit"
              v-for="img in item.pictures"
              :key="img"
              :src="img"
            ></image>
          </navigator>
        </view>
      </view>

      <!-- 新鲜好物 -->
      <view class="panel fresh">
        <view class="title">
          新鲜好物
          <navigator
            hover-class="none"
            class="more"
            url="/pages/recommend/index?type=5"
            >更多</navigator
          >
        </view>
        <view class="cards">
          <navigator
            hover-class="none"
            :url="`/pages/goods/index?id=${item.id}`"
            v-for="item in homeNew"
            :key="item.id"
          >
            <image mode="aspectFit" :src="item.picture"></image>
            <view class="name">{{ item.name }}</view>
            <view class="price">
              <text class="small">¥</text>{{ item.price }}
            </view>
          </navigator>
        </view>
      </view>

      <!-- 热门品牌 -->
      <view class="panel brands">
        <view class="title">
          热门品牌
          <navigator hover-class="none" class="more" url="/pages/list/index"
            >更多</navigator
          >
        </view>
        <view class="cards">
          <navigator hover-class="none" url="/pages/goods/index">
            <image
              mode="aspectFit"
              src="http://static.botue.com/erabbit/static/uploads/brand_logo_1.jpg"
            ></image>
            <view class="name">小米</view>
            <view class="price">99元起</view>
          </navigator>
          <navigator hover-class="none" url="/pages/goods/index">
            <image
              mode="aspectFit"
              src="http://static.botue.com/erabbit/static/uploads/brand_logo_2.jpg"
            ></image>
            <view class="name">TCL</view>
            <view class="price">199起</view>
          </navigator>
          <navigator hover-class="none" url="/pages/goods/index">
            <image
              mode="aspectFit"
              src="http://static.botue.com/erabbit/static/uploads/brand_logo_3.jpg"
            ></image>
            <view class="name">饭小宝</view>
            <view class="price">9.9起</view>
          </navigator>
          <navigator hover-class="none" url="/pages/goods/index">
            <image
              mode="aspectFit"
              src="http://static.botue.com/erabbit/static/uploads/brand_logo_4.jpg"
            ></image>
            <view class="name">鳄鱼</view>
            <view class="price">299起</view>
          </navigator>
        </view>
      </view>

      <!-- 猜你喜欢 -->
      <Guess :homeGoodsGuessLike="goodsGuesslike" :hasMore="hasMore"></Guess>
    </scroll-view>
  </view>
</template>

<script>
// 引入 自定义导航栏 组件
import Navbar from "./components/Navbar.vue";
// 引入 封装好发送请求的代码
import {
  getHomeBanner,
  getHomeCategoryHeadMutli,
  getHomeHotMutli,
  getHomeNew,
  getHomeGoodsGuesslike,
} from "@/http/home";

export default {
  components: { Navbar },
  data() {
    return {
      // 首页-广告区域
      banners: [],
      // 首页-前台类目-小程序
      categoryHeadMutli: [],
      // 人气推荐
      hotMutli: [],
      // 新鲜好物
      homeNew: [],
      // 猜你喜欢 数组
      goodsGuesslike: [],
      // 有没有猜你喜欢 下一页数据
      hasMore: true,

      // 控制下拉刷新的状态
      refresherTriggered: false,
    };
  },

  onLoad() {
    this.loadData();
  },
  methods: {
    // 获取首页所有数据  和 渲染
    loadData() {
      // 下面这段代码  也是 两个函数同时执行，  各自请求成功，各自完成赋值 不存在 函数1 等待函数2执行 情况！！！
      this.guessParams = {
        page: 1,
        pageSize: 20,
      };
      this.guessTotalPages = 1;
      // Promise.all() 返回值也是 promise ，所以 才可以  .then 往下去调用
      return Promise.all([
        this.getHomeBanner(),
        this.getHomeCategoryHeadMutli(),
        this.getHomeHotMutli(),
        this.getHomeNew(),
        this.getHomeGoodsGuesslike(this.guessParams),
      ]);
    },

    async getHomeBanner() {
      // 只要一个函数 你拿  async 去做 修饰 ，那么函数的返回值 就会自动的变成promise
      const result = await getHomeBanner();
      this.banners = result.result;
      // console.log(2);
    },
    async getHomeCategoryHeadMutli() {
      const result = await getHomeCategoryHeadMutli();
      this.categoryHeadMutli = result.result;
      // console.log(3);
    },

    async getHomeHotMutli() {
      const result = await getHomeHotMutli();
      this.hotMutli = result.result;
      // console.log(4);
    },
    async getHomeNew() {
      const result = await getHomeNew();
      this.homeNew = result.result;
      // console.log(5);
    },
    async getHomeGoodsGuesslike(params) {
      const result = await getHomeGoodsGuesslike(params);
      // 给总页数赋值
      this.guessTotalPages = result.result.pages;
      // 给猜你喜欢 数组赋值
      this.goodsGuesslike = result.result.items;

      // console.log(6);
    },

    //  scroll-view 滚动条触底事件
    async onScrollTolower() {
      //  判断 有没有下一页数据
      // 当前页数 和 总页数
      if (this.guessParams.page >= this.guessTotalPages) {
        // 没有下一页数据了
        uni.showToast({ title: "没有更多数据了", icon: "none" });
        this.hasMore = false;
      } else {
        // 有没有下一页数据
        this.guessParams.page++;
        const result = await getHomeGoodsGuesslike(this.guessParams);
        // 数据回来，数组合并
        this.goodsGuesslike = [...this.goodsGuesslike, ...result.result.items];
      }
    },
    // 下拉刷新
    async onReRresherRefresh() {
      // 设置 下拉刷新状态
      this.refresherTriggered = true;

      // 业务代码
      this.banners = [];
      this.categoryHeadMutli = [];
      this.hotMutli = [];
      this.homeNew = [];
      this.goodsGuesslike = [];
      this.hasMore = true;
      // this.guessParams.page = 1;
      // this.guessTotalPages = 1;
      // 业务代码

      // console.log(1);
      await this.loadData(); // 这个内部  发送请求的一堆函数

      // console.log(7);
      // 保证 数据都回来  才执行这行代码
      this.refresherTriggered = false;
    },
  },
};
</script>

<style lang="scss" scoped>
.content {
  height: 100vh;
  display: flex;
  flex-direction: column;
}
.main {
  flex: 1;
  overflow: hidden;
  background-color: #f7f7f8;
}
/* 公共面板 */
.panel {
  margin: 20rpx 20rpx 0;
  border-radius: 10rpx;
  background-color: #fff;
  .title {
    display: flex;
    align-items: center;
    padding: 24rpx 24rpx 0;
    font-size: 32rpx;
    color: #262626;
    position: relative;
    text {
      font-size: 24rpx;
      color: #7f7f7f;
      margin-left: 18rpx;
    }
  }
  .more {
    position: absolute;
    right: 24rpx;
    font-size: 26rpx;
    color: #7f7f7f;
  }
  .cards {
    display: flex;
  }
  .name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}
/* 推荐专区 */
.recommend {
  display: flex;
  flex-wrap: wrap;
  .item {
    display: flex;
    flex-direction: column;
    width: 50%;
    height: 254rpx;
    border-right: 1rpx solid #eee;
    border-top: 1rpx solid #eee;
    &:nth-child(2n) {
      border-right: 0 none;
    }
    &:nth-child(-n + 2) {
      border-top: 0 none;
    }
  }
  .cards {
    flex: 1;
    padding: 15rpx 20rpx;
    justify-content: space-between;
    image {
      width: 48%;
    }
  }
}

/* 新鲜好物 */
.fresh {
  min-height: 320rpx;
  .price {
    line-height: 1;
    text-align: left;
    font-size: 26rpx;
    color: #cf4444;
  }
  .small {
    font-size: 80%;
  }
}
.fresh .cards navigator,
.brands .cards navigator {
  width: 25%;
  padding: 15rpx 20rpx 20rpx;
  line-height: 1;
  text-align: center;
}
.fresh image,
.brands image {
  width: 126rpx;
  height: 126rpx;
}
.fresh .name,
.brands .name {
  margin: 20rpx 0 16rpx;
  font-size: 24rpx;
  color: #262626;
}
.brands {
  .price {
    font-size: 24rpx;
    color: #999;
  }
}
</style>
